What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 5900-6: Prothrombin Fragment 1.2 Qn

Name: LOINC Code 5900-6: Prothrombin Fragment 1.2 Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:39.276Z

5900-6 is a LOINC code used to identify Prothrombin Fragment 1.2 Qn in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Prothrombin fragment 1+2. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Prothrombin fragment 1+2. It is commonly used with the system or sample type Ser/Plas.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Both

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Prothrombin Fragment 1.2 [Units/volume] in Serum or Plasma
Prothrombin fragment 1+2
Arbitrary concentration; COAGULATION; Coagulation factor II; F1.2; Factor 2; Factor II; Frag; Fragments; Hematology; Heme; i; II; Pl; Plasma; Plsm; Point in time; Pro Frg1+2; Prothombin; Prothrm; Prothromb; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Prothrombin Fragment 1.2 QnProthrombin Fragment 1.2 [Units/volume] in Serum or PlasmaPro Frg1+2 SerPl-aCncProthrombin fragment 1+2COAGProthrombin fragment 1.2, BloodACnc

Frequently asked questions

Code details

Code5900-6

SystemLOINC

Display nameProthrombin Fragment 1.2 Qn

DescriptionProthrombin fragment 1+2

Short namePro Frg1+2 SerPl-aCnc

ComponentProthrombin fragment 1+2

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCOAG

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Prothrombin fragment 1.2, Blood

Part names

Prothrombin fragment 1+2ACncPtSer/PlasQnProthrombin Fragment 1.2Arbitrary ConcentrationPoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.